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gorann

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Everything posted by gorann

  1. gorann

    Bubble in the TEC140.

    I see that Baader now make 3.5 nm Ha filters (much cheaper than Astrodon). Has anyone tested them?
  2. Yes, the 70D and 60D have different CMOS chips so there is possibly a difference, although I doubt it is significant and the filters in front of the chips may be the same. Maybe there is some info on this page: https://www.cloudynights.com/topic/577770-which-dslrs-have-the-most-ha-response-un-modded/ The cheapest option is probably to buy an Astronomik clip filter. I bought both a 12 nm and 6 nm one and my recommendation is to go for the cheaper 12 nm filter as so little light goes through the 6nm filter that it is almost impossible to focus the scope (at least using live view). The 12 nm filter is 199 Euro, see: https://www.astronomik.com/en/clip-filter/clip-filter-canon-aps-c.html
  3. I have tried Ha imaging with a Canon 60D, which is quite similar to the 70D, and it definitively picks up some Ha. Here is an example where I used a 12nm Ha clip filter (Astronomik) and a Canon 300mm f/4 lens. 6 x 25 min exposure:
  4. gorann

    Bubble in the TEC140.

    Thanks Olly! You made my year since I invested in an Esprit 150 just before astrodarkness left us up here!!
  5. gorann

    Bubble in the TEC140.

    That is more than excellent Olly! Not far at all from the Liverpool Telescope version. Apparently a 140 mm refractor can compete with a 20 000 mm reflector. Did you ever test your hypothesis that a small scope with a small pixel camera can match a large scope with a large pixel camera? (I have not been checking SGL daily recently as we have no astrodarkness up here and a fantastic summer to enjoy)
  6. gorann

    NGC7129 - fantastic object!

    Great image Olly! Book-marked it in my things to do folder if it is still up there when astrodarkness reaches Sweden. Except for chasing blood sucking instects, as Wim pointed out, we have to settle for watching the world cup in football up here....
  7. gorann

    First Light (almost) Skywatcher Esprit 150ED

    Very promising. Congrats on the new scope. I also only had a few minutes with my new Esprit 150 before astrodarkness left Sweden. Even if I love summer, this makes me almost long for the autumn.....
  8. gorann

    M101 LHaRGB 30 Hours

    In PS these halos can at least be suppressed easily using curves selectively. First check the sky background lightness with the picker. In this image it was about 30/30/30. Then anchor the curve from 30 and below. Then bring down the brightness above that point (but less in the brightest part of the histogram so the star will still shine). Then use the brush tool on the curves mask and only apply the curves selectively to the stars with halos. This was a 5 min job (but maybe a bit quick and drity - but works as a demonstration).
  9. gorann

    M101 LHaRGB 30 Hours

    I really like this image, with a lot of detail and nice Ha regions standing out! If I should have some comments I also think it is a bit too pink, even in the last version. The big star to the left looks a bit odd, possibly being affected by some optical shortcommings (the halo being squarish in shape and with colour artefacts) so maybe just get rid of it by cropping the image, which would also move the galaxy towards the centre. Just a thought....
  10. gorann

    ZWO ASI 178MC - IR Cut protector

    Another reason to cut out IR and UV is that refractors (and probably the correctors for reflectors) are optimized for visible light and IR and UV will be out of focus and blurr the image.
  11. gorann

    How good is this?

    Yes Olly, I obviously see the reason why you do not want to hang anyone out and I think Wim elegantly gave me a hint of what you talk about by pointing towards an image from the PI site - so no one to blame.
  12. gorann

    M51 - 30 hours

    Intriguing amount of dust you captures around it. Congratulations! Very dramatic, to me it looks like you caught it in a storm with a strong wind from the east.
  13. gorann

    How good is this?

    I can see what you mean Wim in that PI tutorial image - looks quite artificial. I guess I get a better feeling for the effects and limits if (when) I start playing with HDRW.
  14. gorann

    How good is this?

    Wim @wimvb& Olly @ollypenrice Since I am primarily a PS person that has never used HDRW in PI so far, could you show me (e.g. by a link to an image) what this HDR mania looks like, so I know what to avoid if I try HDRW. By the way, can HDRW be used on images that have been non-linearly stretched (i.e. can I try it on some of my finished PS images)?
  15. gorann

    How good is this?

    There is even a youtube video about the place, which seems to be a site specializing in hosting remote obsies (see http://obstech.cl/)
  16. gorann

    Help with Focusing please?

    Wim would probably say yes, and I am quite sure it is 12.5 mm you need. Field flatteners need a specific distance to the chip, in your case 55 mm. I would guess that 12 or 13 mm would also do the job, but the further you get away from the ideal distance the more curvature you will have (oval stars in the corners). Teleskop Express is a good sourse for spacers.
  17. gorann

    How good is this?

    Here it is: http://www.cielaustral.com/cielaustral.php
  18. gorann

    How good is this?

    Stunning! Unfortunately it is too low on the horizon here for even a half decent imaging attempt. If I get it right it was aquired from a remote obsy high up in the mountains in Chile, which may have helped a bit. Is it a mosaic? Otherwise 109 hours must be close to a record.
  19. gorann

    Optical resolution in DS imaging.

    Thanks for that Mark, amazing image that tells me that I may keep my 11" SCT and I bet against Olly comming up with something similar with his 4" refractor and minute camera.... By the way this is what M51 looks like through a 2 meter RC - 3.6 hours of data that I processed from the Liverpool scope recently so aperture cannot be totally ignored
  20. gorann

    Optical resolution in DS imaging.

    Olly, the result of your experiment will be very interesting, and I am slightly scared. Maybe it will tell me that I should sell my 11" EdgeHD before I even have had a chance to use it and buy a cheap small pixel camera, if there will be a market for large SCTs after your experiment......
  21. gorann

    Abell 61

    Yes, that is lovely ideed. I assume that central blue star is what remains of that exploding star.
  22. gorann

    M110 reworked

    Very nice, interesting and unnusual image Wim. You are obviously keeping up your processing skills over our bright summer. I should get onto it soon but I have taken a break to enjoy the fantastic early summer we have now here in Sweden. 30°C here today. I have some stuff to process when the normal rainy summer weather returns.
  23. As everyone says, this is a great image! Your Nikon af-s 85.f1.8 is apparently a great performer. Stars look good to me all the way to the corners - not many lenses in that price range can achieve this (Samyang/Rokinon being an exception). At 60° N this is of course not a target, but I should try it one day when traveling south. You clearly demonstrated that no heavy equipment is needed.
  24. Yes, this is a very nice, dramatic and still subtle image. I like it a lot and I can see why you use RGB for the stars - I am no fan of the pure white ones of many NB images.
  25. gorann

    Whale & Hockey Stick Galaxies

    Beautiful Barry! I am amazed that you can get 12.5 hours of darkness at 50.4 °N now. I cannot get one minute here at 59.8°N. What a difference 1000 km do! Could it have to do with the curvature of the earth and is it the final nail in the coffin for the flat earth proponents?
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